The Freezing Unit and the Decolouring Unit are introduced into the process to control the color grade of the BA solution and the quality of the product.
采用冷冻和活性炭脱色工艺来控制水洗BA色级，减少BA液中有机杂酸和高分子蛋白的含量以保证最终产品的质量；
The heater's job is to prevent hydrazine fuel in a feed pipe to a unit from freezing.
加热器的工作是预防装置进料管中的联氨燃料冻结。
This article studies the unit mainly applied in the industrial freezing, also in the middle and small scale central air conditioning.
所研究的机组主要应用于工业冷冻，也可作为中小型中央空调使用。
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